three.m

matlab的一些基础程序

%c) x(n)=cos(0.04*pi*n)+0.2*w(n); 0<=n<=50
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switch  b 
    case  'ab'
        clc,clf 
       subplot('Position',    [0.1 0.3 0.8 0.6])
m2=uicontrol(gcf,'style','pushbutton','string','上一题','fontsize',18,'units','normalized','position',...
    [0.1 0.1 0.2 0.1],'foregroundcolor','r','backgroundcolor','b','callback','two');
m3=uicontrol(gcf,'style','pushbutton','string','回目录','fontsize',18,'units','normalized','position',...
    [0.4 0.1 0.2 0.1],'foregroundcolor','r','backgroundcolor','b','callback','abc');
m3=uicontrol(gcf,'style','pushbutton','string','下一题','fontsize',18,'units','normalized','position',...
    [0.7 0.1 0.2 0.1],'foregroundcolor','r','backgroundcolor','b','callback','one');
        
    case  '1'    
      figure;
end
n=[0:50];
x=cos(0.04*pi*n) + 0.2*randn(size(n));
stem(n,x);title('Sequence in Example 3.1c');
xlabel('n'); ylabel('x(n)');axis([0,50,-1.4,1.4]);
%